[smokel]

This Dutch book [1] by Gummbah has the text "Kooptip" imprinted on the cover, which would roughly translate to "Buying recommendation". It worked for me!

[1] https://www.amazon.com/Het-geheim-verdwenen-mysterie-Dutch/d...

[DonHopkins]

https://en.wikipedia.org/wiki/Steal_This_Book